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1 contact with its seat or valve-face by a regu UNITED STATES PATENTOFFICE.

CHARLES V. BARNABSLQF SALEM, OHIO, ASSIGNOR OF ONE-HALF TO THE BUCKEYEENGINE COMPANY, OF SAME PLACE.

STEAM-ENGINE VALVE.

SPECIFICATION forming part. of Letters Patent No. 340,541, dated April27, 1886.

Application filed January 27, 1886.

To aZZ whom it may concern.-

Be it known that I, OHARLEs W. BARNABY, of Salem, in the county ofGolumbiana and State of Ohio, have invented certain new and usefulImprovements in Steam-Engine Valves, of which improvements the followingis a specification.

My invention relates to that class of steamengine distribution-valveswhich are provided with ports and passages through which steam isadmitted to and exhausted from the cylinder without entering the chestin which the valve traverses, the valve being maintained in latedpressure of steam admitted to the chest for such purpose independentlyof the cylinder-supply. 4

The object of my invention is to reduce the area and travel of the valverelatively to a given area of port-openings, or to afford betterport-openings relatively to a given valve movement, or both, therebyincreasing the leverage of the governor on the valve in single-valveautomatic cut-oii engines, reducing the throw and diameter of theeccentric, and consequently the friction. and tendency to heat at highspeed, and reducing the power required and wear involved in operatingthevalve.

To this end my invention, generally stated, consists in asteam-distribution valve having a longitudinal exhaust passage orpassages connecting two or more exhaust-chambers, and a longitudinalsteam passage or passages connecting two or more steam-chambers.

The improvements claimed are hereinafter fully set forth.

In the accompanying drawings, Figure 1 is a longitudinal central sectionthrough a steamcylinder and valve-chest and a single-ported valveillustrating an embodiment of my invention; Fig. 2, alongitudinalsection through the valve at the line at w of Fig. 4; Figs. 3and 4,transverse sections through the valve at the lines y y and z 2,respectively, of Fig. 2; Fig. 5, a longitudinal central section througha steam-cylinder and valve-chest and a doubleported valve embodying myinvention; Fig. 6, a longitudinal section through said valve at the line10 w of Fig. 7; Fig. 7, a horizontal section through the valve at theliner '0 of Serial No. 169.837. (No model.)

Fig. 6; and Figs. 8 and 9, transverse sect-ions through the valve at thelines r r andt t, respectively, of Fig.6.

My invention is herein exemplified as embodied in a reciprocating-slidedistributionvalve of what is ordinarily termed the D or cup type, but,as will bereadily obvious. is equally applicable to valves adapted torock or vibrate over longitudinally segmental 6o valvefaces, and,without change of principle, to valves of the piston type, and to valves.having two or more working-faces, as on the side or back as well as theface next the cylinder. 6 5

Referring to the drawings, the cylinder 1 is closed at its ends by heads2, in the usual manner, and is fitted with a piston, 3, secured upon apiston-rod, 4. A valve-chest, 5, closed at top by a cover, 6, is castupon or secured to the cylinder 1, and atrulyplane valvc-face, 7, overwhich the valve traverses, is formed on the outer surface of thecylinder within the chest 5. A central steam supply passage, 8, to theouter end of which the steam-pipe is connected, and which opens by aport, 9", to the valveface, is cored centrally in the cyliir dershell,and exhaust-passages 9 9, opening by ports 10 10 to the valveiace andleading to a suitable exhaust-pipe, are cored in the cylindershelladjacent to and on opposite sides of the steam-passage 8. Induction andeduct-ion ports 11 l1 lead from opposite ends of the cylinder to thevalve face adjoining the exhaust-ports 1O 10. 8 5

The valve 12 is a box or chambered casting faced oii' truly on itsside,which bears against the valve-face, and connected to a valve-stem,13, which is reciproeated, through proper intermediate connections, byan eccentric in the 0 ordinary manner. A steam chamber, 14, which opensto the valve-face by a port, 15, is formed centrally within the valve12, and is connected by a longitudinal steam passage or passages, 16,(two being preferably em- 5 ployed-one at each side of the valve-inorder to equalize its bearing upon the valveface,) with twosteam-chambers, 17 17*,which are located at opposite ends of the valve,and open by ports 1818*, respectively, to the valveface.

Two exhaust-chambers, 19 19, extend across the valve,one on each side ofthe central steamchamber, said chambers opening to the valveface byports 20 20, respectively, and being connected by a central longitudinalexhaustpassage, 21.

In the position of the valve shown in Fig. 1, being at the left-hand endof its stroke, steam from the cylinder-supply passage 8 enters thecentral steam-chamber, 14, of the valve through the ports 9 and 15, andpasses through the passages 16 to the right-hand steam-chamber 17, andthence through the val ve-port 18 to the right-hand cylinder-port 11 Theexhaust from the left-hand cylinder-port 11 enters the exhaust-chamber19 through the port 20, and passes from said chamber through the ports20 and 10 to the exhaustpassage 9, and through the passage 21,exhaust-chamber 19 and ports and 10 to the exhaust-passage 9.

The exhaust-steam which enters the exhaustchamber 19 of the valvethrough the cylinderport 11 being delivered directly from said chamberto the exhaust-passage 9, and simultaneously delivered through thelongitudinal exhaust-passage 21 and chamber 19 to the exhaust-passage 9,it will be seen that a reduction is thereby effected in the width of theexhaust-ports l0 and 10 and 20 and 20, and consequently in the lengthand area of the valve 12. A further reduction'in the area of the valve,as well as in the length of its travel for a determined port-opening, iseffected by the application of the construction above described in amultiported valve having one or more additional pairs of steam andexhaust chambers, said steam and exhaust chambers, respectively, beingsimilarly connected by passages extending longitudinally through thevalve, one of the additional pairs of steam-chambers being either singleor double ported, according as it may be desired to double-port or totriple-port the va ve for induction.

A double-ported valve of such character is illustrated in Figs. 5 to 9,inclusive, referring to which it will be seen that the cylindersteampassage 8, exhaust-passages 9 9, and steam and induction ports 1111 are similar to those first described, except that the ports 11 11 areeach divided and open to the valve-face by two ports, I) c and (Z c,respectively, each of said ports being one-half the width of the mainport, 11 or 11, out of which it leads. The central steam-chamber, 14, ofthe valve 12, which opens to the valveface by a port, 15, is connectedby thelongitudinal lateral steampassages 16 with apair of intermediatesteamchambers, 17 17 having face-ports 18 18, and with a pair of endsteam-chambers, 21 24, having face-ports 25. The exhaust-chambers 19 19,which open to the valve-face by ports 20 20, are connected by alongitudinal central passage, 21, with each other and with an additionalpair of exhaust-chambers,22 22", provided, respectively, with face-ports23 23*, the exhaust-chamber 22 being interposed between thesteam-chambers 21 and 17, and the exhaust-chamber 22 being interposedbetween the steam-chambers 17 and 24. The valve is thus double-portedboth for steam and exhaust, with a corresponding reduction in its areaand length of travel, and, if further reduction is desired, it may betriple-ported in a similar manner, either by the addition of anothersteam and another exhaust chamber at each of its ends, said chamberscommunicating with the steam-passages 16 and exhaust passage 17,respectively, or by forming two independent face-ports in each of theend steam-chambers, each of the cylinder-ports 11 and 11 being in eithercase divided into three valve-face ports, in lieu of two, as in the caseof the double-ported valve shown. In the case in which the end chambershave two ports the valve will be triple-ported for induction anddouble-ported for exhaust.

The governing principle of my invention being the provision of a seriesof ported steamchambers and ported exhaust-chambers connected byindependent longitudinal passages,

'so that the traverse of supply and exhaust steam may be effectedcoincidently to and from theseveral ch ambers of each seriesrespectively, the number, form,and location of said chambers andpassages may be varied materially, in the discretion of the constructer,without departing from the essence of my invention. Thus, for example,there may be a single steam-passage extending longitudinally on one sideof the valve and a single exhaust-passage on the other, branches fromone extending under the other at the several ports. Again, if desired,the steam and exhaust passages may be located one above the other,branches or connections from the upper passage passing through the lowerto the several chambers which are to be connected by the upper passage.

The construction hereinbefore described and shown may likewise beapplied in a valve in which the steamis either supplied to or exhaustedfrom the valve, or both, at its end, and through cylinder-ports locatedbeyond or outside of the induct-ion and eduction ports 11 11.

I claim as my invention and desire to secure by Letters Patent 1. Thecombination, in asteam-distribution valve, of two or moresteam-chambers, each having a port or opening on the face of the valve,two or more similarly-ported exhaustchambers, a longitudinal passage orpassages connecting the steam-chambers, and a longitudinal passage orpassages connecting the exhaust-chambers, substantially as set forth.

2. The combination, in a steam-distribution valve, of a series ofalternate steam and exhaust chambers, each having a port or opening onthe face of the valve and extending transversely to the line of traversethereof, a steampassage extending longitudinally through the valve andcommunicating with each of the steam-chambers, and an exhaustpassageextending longitudinally through the valve and communicating with eachof the ex haustchambers, substantially as set forth.

3. The combination, in a steam-distribution valve of box or chamberedform, of a series of transverse chambers, each having a port or openingon the face of the valve, a central longitudinal passage communicatingwith alternate members of the series of chambers which extend below itand beyond its outer sides,

or passages, and a longitudinal steam passage or channel passing over atransverse exhaust chamber and port and connecting two steam ports orpassages, substantially as set forth.

5. A multiported steam-distribution valve having a series of transverseexhaust-chambers, each interposed between two transverse steam-chambers,each of said chambers having a port or opening on the face of the valve,a longitudinal exhaust-passage extending over each of the steam-chambersand communicating with each of the exhaust-chambers, and a longitudinalsteam passage extending over each of the exhaust-chambers andcommunicating with each of the steam-chambers, substantially as setforth.

CHARLES XV. BARNABY. \Vitnesses:

RALPH S. AMBLER, B. S. AMBLER.

